add warning for export of lowercase too.
add warning for export of lowercase too.

R=ken
OCL=22887
CL=22887

h8liu/golang,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang,tianon/debian-golang,h8liu/golang,tianon/debian-golang,wesolows/golang-old,bdwalton/debian-golang,gnanderson/go,tv42/old-go,h8liu/golang,ssrl/go,bdwalton/debian-golang,h8liu/golang,wesolows/golang-old,apparentlymart/golang,apparentlymart/golang,h8liu/golang,apparentlymart/golang,tv42/old-go,tianon/debian-golang,firebitsbr/golang-old,gnanderson/go,h8liu/golang,tv42/old-go,dsriram/golang,nightlyone/golang,bdwalton/debian-golang,bdwalton/debian-golang,apparentlymart/golang,gnanderson/go,nightlyone/golang,dsriram/golang,pombredanne/go-deleteme,tv42/old-go,h8liu/golang,wesolows/golang,pombredanne/go-deleteme,pombredanne/go-deleteme,tianon/debian-golang,ssrl/go,dsriram/golang,gnanderson/go,tianon/debian-golang,wesolows/golang,wesolows/golang,tv42/old-go,nightlyone/golang,bdwalton/debian-golang,firebitsbr/golang-old,tianon/debian-golang,tv42/old-go,gnanderson/go,gnanderson/go,dsriram/golang,ssrl/go,gnanderson/go,pombredanne/go-deleteme,ssrl/go,dsriram/golang,wesolows/golang-old,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang-old,tianon/debian-golang,wesolows/golang-old,apparentlymart/golang,bdwalton/debian-golang,pombredanne/go-deleteme,nightlyone/golang,bdwalton/debian-golang,apparentlymart/golang,ssrl/go,dsriram/golang,ssrl/go,firebitsbr/golang-old,wesolows/golang,bdwalton/debian-golang,pombredanne/go-deleteme,nightlyone/golang,dsriram/golang,nightlyone/golang,nightlyone/golang,wesolows/golang-old,wesolows/golang,ssrl/go,apparentlymart/golang,wesolows/golang,pombredanne/go-deleteme,tianon/debian-golang,tv42/old-go,firebitsbr/golang-old,firebitsbr/golang-old